Control Annual Heat Gain through favorable orientation and design of facades" is a passive design strategy suggested in the GRIHA Manual. The strategy itself says to control annual heat gain, however, it has been suggested verbally by the GRIHA team to consider only summer months for this calculation. Kindly clarify.
To demonstrate the compliance the project team has 2 ways one is simulation approach and the other is manual calculation approach.
If you opt for a simulation approach, annual analysis can easily be computed, however in case of manual calculation the project team needs to consider a worst-case scenario where the insolation values for the summer month (except cold climate zone) needs to be considered for computing the results.